1. Faculty of Science, Department of Chemistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
2. Natural Product Research Center of Excellence, Prince of Songkla University, Hat Yai, Songkhla, Thailand
3. Faculty of Traditional Thai Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
4. Faculty of Science, Department of Microbiology, Prince of Songkla University, Hat Yai, Songkhla, Thailand